SUNConferences, RAPDASA 2014

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COMPARATIVE STUDY OF MICROSTRUCTURAL, ELECTROCHEMICAL AND TRIBO MECHANICAL PROPERTIES OF ELECTRODEPOSITED ZN-Al2O3/Cr2O3/SiO2 NANOCOMPOSITE COATINGS
Nicholus Malatji, A. P.I. Popoola

Last modified: 2014-11-02

Abstract


Nano-sized particle incorporation into metal matrix for fabrication of advance surface coatings find variety of applications in surface protection techniques. Al2O3, Cr2O3 and SiO2 nanoparticles have been codeposited with Zn using electrodeposition process to produce Zn nanocomposite coatings. The fabricated coatings were characterized using Scanning Electron Microscope affixed with Energy Dispersive Spectroscopy and X-ray diffractometer. The mechanical and tribological properties of the coatings were investigated using diamond microhardness indenter and dry abrasive wear tester. Zn-10g/L Cr2O3 nanocomposite exhibited the highest microhardness of 228 HV and Zn-5g/L Al2O3 nanocomposite possessed the highest corrosion resistance and lowest wear loss. Zn-5g/L SiO2 nanocomposite showed good stability as compared to other composite coatings. The incorporation of the nanoparticles of Al2O3, Cr2O3 and SiO2 induce grain refinement and modify crystallographic orientation of Zn matrix. Zn-5g/L Al2O3 and Zn-5g/L SiO2 proved to be better coatings which can find variety of industrial applications where both mechanical and electrochemical properties are required.




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